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Lapis MCUs designed for single-phase DC motor control

25 Nov 2013

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Lapis Semiconductor has launched the ML610Q101 and ML610Q102 8bit microcontrollers for small single-phase DC motor control. The products' features allow for precise control of the rotation and speed of single-phase fans and motors in electrically noisy settings, such as industrial equipment and computer systems. The company says the microcontrollers do not require external components, thus reducing board area and system costs.

An internal oscillator and multiple timers are utilised to reduce rotational speed variations, minimising audible noise. In addition, built-in hysteresis allows the differential comparator to monitor the Hall element on the motor to determine motor speed and direction, ensuring precise speed control. (Hall elements are less expensive and smaller than comparable Hall effect sensors.) Additional features include a compact 16pin package (4mmx4mm), making them suitable for the smallest fans, and high noise immunity (tested to ±30kV in IEC61000-4-2 noise testing) that enables support for applications with demanding environmental electrical noise requirements.

In response to market demands for smaller MCUs with high electrical noise immunity and precise rotational control, Lapis Semiconductor has developed an integrated oscillator circuit and voltage regulator for the internal power supply that do not require external capacitors, resistors, or crystals. The benefits include a two-fold improvement in oscillator accuracy compared with previous methods and reduced board space, since no external components are required. The high accuracy oscillator circuit allows for minimal rotational variations and precise speed when controlling single-phase fan motors, while six 8bit timers allow the software to provide motor performance through soft switching control. Also, careful circuit design and layout enable high noise immunity with few external components, making operation possible through ±30kV discharges – exceeding the Class 4 (±15kV) measurement limit, the highest class defined by the IEC61000-4-2 standard established by the International Electrotechnical Commission (IEC). This makes them suitable for use in industrial equipment, especially in applications exposed to high electrical noise environments such as motor control.

To make evaluation easy, ROHM offers a complete design and evaluation environment that includes an ML610Q102 reference board along with software development and debugs tools.

The ML610Q101-NNNMBZ0ATL is priced at $0.45 per 10,000 units, while the ML610Q102-NNNMBZ0ATL is priced at $0.50 per 10,000 units.

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